Certs - bugfix cert_whitelist output

* output after cert_whitelist -a or -d purported to be the whitelist entries
  for the requested course, but in fact were all of the entries in every
  course. This commit fixes that.
Textbooks accessibility changes

Removed image-based textbook info from XML tutorial.

Added not about accessibility and textbooks to Building a Course file.
Bok choy tests output XUnit reports
Updated change log
fix 2 links that were broken during i18n changes.
Release Notes 1-23-14

First Draft
Merge pull request #2264 from edx/jsa/fix-forums-links-rc

fix 2 links that were broken during i18n changes.
Modify jquery.timeago to better support i18n

Use string interpolation instead of concatenation of prefix, content,
and suffix. This is motivated by the fact that Transifex does not accept
empty strings for translation (even when pgettext is used to provide
context).
visual styling changes to components and static pages in order to use updated icon button styling for duplicate and delete actions
Remove comment for how to install PIL

We use Pillow now, which can be installed via PyPI
Remove CONTRIBUTING.md

Github includes a "Please review the guidelines for contributing
to this repository" link when creating a pull request, and it links
to the Markdown version of this file, which is annoying. Removing
the file should redirecto the link to the reStructuredText version
of this file.
adjusted unit_spec.js to reflect new HTML structure, and corrected screenreader label for delete button
Correct three typos in video documentation
updated static pages tests to reflect html element change in component.html
BLD-237: Persist speed preferences between videos.
Merge branch 'release'
Use subprocess.STDOUT, rather than sys.STDOUT to rebind stderr
Merge pull request #2280 from edx/db/remove-contributing.md

Remove CONTRIBUTING.md
i18n xmodule/course_module.py

LMS-1747
Merge pull request #2279 from edx/db/remove-pil-comment

Remove comment for how to install PIL